首页
外语
计算机
考研
公务员
职业资格
财经
工程
司法
医学
专升本
自考
实用职业技能
登录
外语
A new biotechnology procedure that could become commercially available in as little as two to four years is "transgenosis", whic
A new biotechnology procedure that could become commercially available in as little as two to four years is "transgenosis", whic
admin
2013-11-29
103
问题
A new biotechnology procedure that could become commercially available in as little as two to four years is "transgenosis", which permits scientists to create an animal with specific traits by adding, removing, inactivating, or repairing genes in an embryo. The additional genes can come from any source. For example, if a gene of interest occurs in mosquitoes—say, one that codes for resistance to a certain disease—it can be removed and placed in the embryo of a farm animal, the several strains of commercially useful transgenic farm animals that will probably emerge in the next few years could include leaner pigs, poultry resisting to influenza or other deadly diseases, sheep with wool that is easier to wash, and goats that produce valuable pharmaceuticals in their milk.
The simplest way to make transgenic animals is to inject a gene into a one-cell embryo and then implant the embryo in another animal. Under the right conditions, the new gene joins one of the embryo’s strands of genes. Each cell created as the embryo divides gets a copy of the new gene. An alternative technique is to incorporate the gene into a type of virus known as a retrovirus that has been modified so it cannot reproduce itself after entering a cell. The virus, which cannot cause disease, delivers the gene to the cell’s nucleus. Often this method is better than gene injection because a retrovirus always delivers just one gene, and the gene is always undamaged and complete.
The new biotechnology procedure discussed in this passage mainly concerns ______.
选项
A、embryos
B、pigs, sheep and goats
C、commercial science
D、improvement of animal strains
答案
D
解析
首先应理解“The new biotechnology procedure”指的是生物学工艺,即动物学转基因技术。commercial science的范围太大而且脱离了“The new biotechnology procedure”的实际意义。因此D项正确。
转载请注明原文地址:https://www.kaotiyun.com/show/PQhO777K
0
考博英语
相关试题推荐
Thegovernmentistobanpaymentstowitnessesbynewspapersseekingtobuyuppeopleinvolvedinprominentcases【21】thetrialo
Thegovernmentistobanpaymentstowitnessesbynewspapersseekingtobuyuppeopleinvolvedinprominentcases【21】thetrialo
Thetwodelegateshadanin-depthexchangeofviewsonhowtoenhancetheir______cooperation.
AmericaLosesaGreatPublicThinkerArthurMiller’sdeathlastweekmeantmorethanthelossofanoutstandingplaywright.
Brazilhasbecomeoneofthedevelopingworld’sgreatsuccessesatreducingpopulationgrowthbutmorebyaccidentthandesign.
Attitudesofrespect,modestyandfairplaycangrowonlyoutofslowlyacquiredskillsthatparentsteachtheirchildrenoverm
Attitudesofrespect,modestyandfairplaycangrowonlyoutofslowlyacquiredskillsthatparentsteachtheirchildrenoverm
Attitudesofrespect,modestyandfairplaycangrowonlyoutofslowlyacquiredskillsthatparentsteachtheirchildrenoverm
IhadvisitedthecapitalbeforealthoughmyfriendArthurhadnot,IfirstvisitedLondonasastudent,reluctantlyreleasedfr
IhadvisitedthecapitalbeforealthoughmyfriendArthurhadnot,IfirstvisitedLondonasastudent,reluctantlyreleasedfr
随机试题
尿毒症患者发生口臭是由于
男,27岁,入院前1天突然出现全身抽搐1次,时间约2分钟,继之患者出现昏迷,血压180/108mmHg,心率62次/min,心前区可闻及心包摩擦音,Balbinski征阴性,血红蛋白52g/L,血小板60×109/L,白细胞3.2×109/L,尿蛋白(++
虚证的病机概念是
A.麻黄碱B.维拉帕米C.氟尿嘧啶D.奥美拉唑E.去甲肾上腺素
电梯的安装、改造、维修,必须由电梯制造单位或者其通过合同委托、同意的依照本条例取得许可的单位进行,()对电梯质量以及安全运行涉及的质量问题负责。
_____人格特征的人,往往追求刺激、新奇,好冒险。【】
给定资料1.近年来,随着国家和地方政府对扶贫攻坚的政策扶持及资金投入力度越来越大,被曝光的涉及扶贫领域的腐败案例不断涌现,扶贫领域俨然已经成为腐败的“重灾区”。扶贫资金被人“惦记”,和其监管难有很大关系。从横向上看,扶贫资金来源过多,多头管理,
设f(x)可导,证明:f(x)的两个零点之间一定有f(x)+f’(x)的零点.
Forthepastfewmonths,artificialintelligence(AI)hasbeenamuchtalkedabouttopicintheworldsofbothpopcultureandsci
この着物はいかにも日本()柄ですね。
最新回复
(
0
)